BIOECONOMIC STUDIES ON THE COLONY OF AN ANT SPECIES, FORMICA JAPONICA MOTSCHULSKY 3. BODY WEIGHT OF THE WORKERS AT THE EMERGENCE FROM THE COCOONS

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  • KONDOH Masaki
    Department of Biology, Faculty of Science, Tokyo Metropolitan University : Present address, Biology Laboratory, Shiraume Junior College

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Other Title
  • クロヤマアリのコロニーに関する生物経済学的研究 : 3.マユから出た時のハタラキアリの体重
  • クロヤマアリのコロニーに関する生物経済学的研究-3-マユから出た時のハタラキアリの体重〔英文〕
  • クロヤマアリ ノ コロニー ニ カンスル セイブツ ケイザイガクテキ ケンキュウ 3 マユ カラ デタ トキ ノ ハタラキアリ ノ タイジュウ エイブン

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Abstract

This paper deals with the body weight and the corpulency of the newly emerged workers of Formica japonica in summer, and their relation to the summer and hibernant types of the workers. Regressions of the live weight and dry weight on the head width of the newly emerged workers in summer are high and the correlation correlation coefficients are 0.89 and 0.79 respectively. The index of corpulency is 1.42×10^<-5> in live weight and 0.32×10^<-5> in dry weight. Both are independent of the head width. These figures are alike to those of the older summer type of the workers of which the individuals are lean. On the contrary the weights of the dark grey workers in the winter nest seemingly emerged during late autumn, are fairly greater than those of the newly emerged workers in summer, and alike to those of the workers of winter type. Therefore, it is presume that the young hibernant workers had been fed and became corpulent during the late autumn. It is concluded that the degree of corpulency of the newly emerged workers is intermediate between that of the out-door workers in summer and the hibernant workers.

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